java上机实验研究.docVIP

Java与面向对象程序设计上机报告 第一题： 修改第五章中StyleOptions程序，允许用户指定字体大小，用单行文本框得到字体大小。 提示：参考例题5.22　5.23 源程序： import javax.swing.*; import java.awt.*; import java.awt.event.*; public class StyleOptionsPanel extends JPanel { private JLabel saying,inputLabel,resultLabel; private JCheckBox bold, italic; private JTextField num; public StyleOptionsPanel() { String numStr; inputLabel=new JLabel(Font Size:); num=new JTextField(8); num.addActionListener(new TempListener()); saying = new JLabel (Say it with style!); saying.setFont (new Font (Helvetica, Font.PLAIN, 36)); bold = new JCheckBox (Bold); bold.setBackground (Color.green); italic = new JCheckBox (Italic); italic.setBackground (Color.green); StyleListener listener = new StyleListener(); bold.addItemListener (listener); italic.addItemListener (listener); add (saying); add (bold); add (italic); add(inputLabel); add(num); setBackground (Color.yellow); setPreferredSize (new Dimension(300, 100)); } private class TempListener implements ActionListener { public void actionPerformed (ActionEvent event) { int number=36; String text = num.getText(); number= Integer.parseInt (text); saying.setFont (new Font (Helvetica, Font.PLAIN, number)); } } private class StyleListener implements ItemListener { public void itemStateChanged (ItemEvent event) { int style = Font.PLAIN; if (bold.isSelected()) style = Font.BOLD; if (italic.isSelected()) style += Font.ITALIC; saying.setFont (new Font (Helvetica, style, 36)); } } } import javax.swing.JFrame; public class StyleOptions { public static void main (String[] args) { JFrame frame = new JFrame (Style Options); frame.setDefaultCloseOperation (JFrame.